java.lang.Object
- org.springframework.batch.item.ItemStreamSupport
- - org.springframework.batch.item.support.AbstractItemStreamItemReader<T>
  - - org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader<T>
    - - org.springframework.batch.item.data.AbstractPaginatedDataItemReader<T>
      - org.springframework.batch.item.data.AbstractNeo4jItemReader<T>

所有已实现的接口:
ItemReader<T>, ItemStream, ItemStreamReader<T>, org.springframework.beans.factory.InitializingBean
直接已知子类:
Neo4jItemReader
```
public abstract class AbstractNeo4jItemReader<T>
extends AbstractPaginatedDataItemReader<T>
implements org.springframework.beans.factory.InitializingBean
```
Restartable ItemReader that reads objects from the graph database Neo4j via a paging technique.
It executes cypher queries built from the statement fragments provided to retrieve the requested data. The query is executed using paged requests of a size specified in AbstractPaginatedDataItemReader.setPageSize(int). Additional pages are requested as needed when the AbstractItemCountingItemStreamItemReader.read() method is called. On restart, the reader will begin again at the same number item it left off at.
Performance is dependent on your Neo4J configuration (embedded or remote) as well as page size. Setting a fairly large page size and using a commit interval that matches the page size should provide better performance.
This implementation is thread-safe between calls to AbstractItemCountingItemStreamItemReader.open(org.springframework.batch.item.ExecutionContext), however you should set saveState=false if used in a multi-threaded environment (no restart available).
从以下版本开始:
3.07
作者:
Michael Minella

字段概要
字段
修饰符和类型字段说明
protected org.apache.commons.logging.Log logger
- 从类继承的字段 org.springframework.batch.item.data.AbstractPaginatedDataItemReader
  page, pageSize, results

构造器概要
构造器
构造器说明
AbstractNeo4jItemReader()

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`afterPropertiesSet()`	Checks mandatory properties
`protected java.lang.String`	`generateLimitCypherQuery()`
`protected java.util.Map<java.lang.String,java.lang.Object>`	`getParameterValues()`
`protected org.neo4j.ogm.session.SessionFactory`	`getSessionFactory()`
`protected java.lang.Class<T>`	`getTargetType()`
`void`	`setMatchStatement(java.lang.String matchStatement)`	An optional match fragment of the cypher query.
`void`	`setOrderByStatement(java.lang.String orderByStatement)`	A list of properties to order the results by.
`void`	`setParameterValues(java.util.Map<java.lang.String,java.lang.Object> parameterValues)`	Optional parameters to be used in the cypher query.
`void`	`setReturnStatement(java.lang.String returnStatement)`	The return statement of the cypher query.
`void`	`setSessionFactory(org.neo4j.ogm.session.SessionFactory sessionFactory)`	Establish the session factory for the reader.
`void`	`setStartStatement(java.lang.String startStatement)`	The start segment of the cypher query.
`void`	`setTargetType(java.lang.Class<T> targetType)`	The object type to be returned from each call to `AbstractItemCountingItemStreamItemReader.read()`
`void`	`setWhereStatement(java.lang.String whereStatement)`	An optional where fragment of the cypher query.

从类继承的方法 org.springframework.batch.item.data.AbstractPaginatedDataItemReader
doClose, doOpen, doPageRead, doRead, jumpToItem, setPageSize

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader
close, getCurrentItemCount, isSaveState, open, read, setCurrentItemCount, setMaxItemCount, setSaveState, update

从类继承的方法 org.springframework.batch.item.ItemStreamSupport
getExecutionContextKey, setExecutionContextName, setName

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - logger
```
protected org.apache.commons.logging.Log logger
```
- 构造器详细资料
  - AbstractNeo4jItemReader
```
public AbstractNeo4jItemReader()
```
- 方法详细资料
  - setParameterValues
```
public void setParameterValues(java.util.Map<java.lang.String,java.lang.Object> parameterValues)
```
    Optional parameters to be used in the cypher query.
    参数:
    parameterValues - the parameter values to be used in the cypher query
  - getParameterValues
```
protected final java.util.Map<java.lang.String,java.lang.Object> getParameterValues()
```
  - setStartStatement
```
public void setStartStatement(java.lang.String startStatement)
```
    The start segment of the cypher query. START is prepended to the statement provided and should not be included.
    参数:
    startStatement - the start fragment of the cypher query.
  - setReturnStatement
```
public void setReturnStatement(java.lang.String returnStatement)
```
    The return statement of the cypher query. RETURN is prepended to the statement provided and should not be included
    参数:
    returnStatement - the return fragment of the cypher query.
  - setMatchStatement
```
public void setMatchStatement(java.lang.String matchStatement)
```
    An optional match fragment of the cypher query. MATCH is prepended to the statement provided and should not be included.
    参数:
    matchStatement - the match fragment of the cypher query
  - setWhereStatement
```
public void setWhereStatement(java.lang.String whereStatement)
```
    An optional where fragment of the cypher query. WHERE is prepended to the statement provided and should not be included.
    参数:
    whereStatement - where fragment of the cypher query
  - setOrderByStatement
```
public void setOrderByStatement(java.lang.String orderByStatement)
```
    A list of properties to order the results by. This is required so that subsequent page requests pull back the segment of results correctly. ORDER BY is prepended to the statement provided and should not be included.
    参数:
    orderByStatement - order by fragment of the cypher query.
  - getSessionFactory
```
protected org.neo4j.ogm.session.SessionFactory getSessionFactory()
```
  - setSessionFactory
```
public void setSessionFactory(org.neo4j.ogm.session.SessionFactory sessionFactory)
```
    Establish the session factory for the reader.
    参数:
    sessionFactory - the factory to use for the reader.
  - setTargetType
```
public void setTargetType(java.lang.Class<T> targetType)
```
    The object type to be returned from each call to AbstractItemCountingItemStreamItemReader.read()
    参数:
    targetType - the type of object to return.
  - getTargetType
```
protected final java.lang.Class<T> getTargetType()
```
  - generateLimitCypherQuery
```
protected java.lang.String generateLimitCypherQuery()
```
  - afterPropertiesSet
```
public void afterPropertiesSet()
                        throws java.lang.Exception
```
    Checks mandatory properties
    指定者:
    afterPropertiesSet 在接口中 org.springframework.beans.factory.InitializingBean
    抛出:
    java.lang.Exception
    另请参阅:
    InitializingBean.afterPropertiesSet()

类 AbstractNeo4jItemReader<T>

字段概要

从类继承的字段 org.springframework.batch.item.data.AbstractPaginatedDataItemReader

构造器概要

方法概要

从类继承的方法 org.springframework.batch.item.data.AbstractPaginatedDataItemReader

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader

从类继承的方法 org.springframework.batch.item.ItemStreamSupport

从类继承的方法 java.lang.Object

字段详细资料

logger

构造器详细资料

AbstractNeo4jItemReader

方法详细资料

setParameterValues

getParameterValues

setStartStatement

setReturnStatement

setMatchStatement

setWhereStatement

setOrderByStatement

getSessionFactory

setSessionFactory

setTargetType

getTargetType

generateLimitCypherQuery

afterPropertiesSet